[PATCH AUTOSEL 4.14 37/59] net: hns: Clean rx fbd when ae stopped.

Sasha Levin
2018-12-26T22:41:07Z

From: Yonglong Liu <liuyonglong@huawei.com>

[ Upstream commit 31f6b61d810654fb3ef43f4d8afda0f44b142fad ]

If there are packets in hardware when changing the speed or duplex,
it may cause hardware hang up.

This patch adds the code to wait rx fbd clean up when ae stopped.

Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/hisilicon/hns/hns_ae_adapt.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ae_adapt.c b/drivers/net/ethernet/hisilicon/hns/hns_ae_adapt.c
index bf930ab3c2bd..a185a8be7999 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_ae_adapt.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_ae_adapt.c
@@ -379,6 +379,9 @@ void hns_ae_stop(struct hnae_handle *handle)

hns_ae_ring_enable_all(handle, 0);

+ /* clean rx fbd. */
+ hns_rcb_wait_fbd_clean(handle->qs, handle->q_num, RCB_INT_FLAG_RX);
+
(void)hns_mac_vm_config_bc_en(mac_cb, 0, false);
}

--
2.19.1